I'll try to teach you how to do it yourself. Open your favorite Internet browser and write your STB's IP address in address field. After pressing Enter, OpenWebif will open. Select LCD4Linux Setup. Will open new window with a tab General and Element "other". Select LCD1 Type Internal Vu+ Duo2 LCD 400x240, other (LCD2, 3) select 'off'. Push 'set settings' on the bottom. Then go to Element "Screen" and select Active Screen > Screen 1 and Screens used for Changing select Screen 1 too (if you need one screen all the time). Push 'set settings' on the bottom. Than select Modus 'On' on above. If you need only a Clock and nothing more, as you wrote, look all bolded and coloured entries in the 'Element' part to switch any screen to
off except the Clock. When selected Clock, select Screen 1, LCD1, type select 'Time', size select 90-120, regardless font type, you'll select on the bottom line. 'Position' about 50 (digits to be in center), 'Aligning' Center, 'Color' select by your taste. The result you'll see on the top immediately. After you'll be glad with your clock view, push 'set settings' on the bottom. After it you can "copy to Media" and "copy to Idle" to make your work faster. But anyhow you must go to Modus Media and Idle to ensure, that all other Element switched off, except 'Clock' (on Iddle Element 'LCD Display' Screens used for Changing select Screen 1. That's all if I did not miss anything